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LMX2487: Source/sink current of OSCout buffer?

Bernard Wiwel
Prodigy 50 points

Part Number: LMX2487

The data sheet for the LMX2487 does not give a source or sink current range for the OSCout buffer.

How much current can be sourced or sinked to/from the buffer output?  Also what are the ranges for the high and low output levels?

  • 0
    TI__Guru** 117470 points

    Hi Bemard,

    I am afraid we don't have the data, I will see if I can grab an EVM to get some test data for you.

  • 0 in reply to Noel Fung
    TI__Guru** 117470 points

    Hi Bernard,

    I was just able to find an EVM to check this out. I think the driving capability of this output is pretty low. VOL = GND; VOH = Vcc (up to 60MHz OSCin, VOH is reducing with higher OSCin frequencies. At 110MHz OSCin, VOH = Vcc - 0.6V).

    OSCout expects high impedance load. I can see waveform distortion even with a 13kΩ load at below 30MHz OSCin, higher frequencies is fine, there is distortion.

    What is your OSCin frequency? I can get a OSCout plot to you at your OSCin frequency.